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Co-Authors
- B. Krishna
- N. P. Balakrishnan
- Debika Mitra
- Raja V. L. N. Sridhar
- M. V. H. Rao
- K. Kalyani
- Anand Chandran
- Monika Mahajan
- J. D. P. V. Tayaramma
- K. V. S. Bhaskar
- K. B. Pramod
- L. V. Prasad
- A. S. Laxmiprasad
- J. A. Kamalakar
- G. Nagendra Rao
- M. Viswanathan
- T. Misra
- C. Lad
- P. Gupta
- J. Rao
- G. Upadhyay
- S. Vinay Kumar
- B. Saravana Kumar
- S. Gangele
- S. Sinha
- H. Tolani
- V. K. Vithani
- B. S. Raman
- C. V. N. Rao
- D. B. Dave
- R. Jyoti
- N. M. Desai
- M. D. Behera
- K. Subashree
- K. Kumar
- P. Deb
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z All
Chakraborty, P.
- Additions to the Pteridophytic Flora of Sikkim Himalayas
Abstract Views :144 |
PDF Views:122
Authors
B. Krishna
1,
P. Chakraborty
1
Affiliations
1 Botanical Survey of India, Gangtok, IN
1 Botanical Survey of India, Gangtok, IN
Source
Nelumbo - The Bulletin of the Botanical Survey of India, Vol 26, No 3-4 (1984), Pagination: 220-221Abstract
No Abstract.Full Text
- Descriptive Notes on some New or Little Known Orchids of Nicobar Islands
Abstract Views :220 |
PDF Views:127
Authors
Affiliations
1 Botanical Survey of India, Port Blair, IN
1 Botanical Survey of India, Port Blair, IN
Source
Nelumbo - The Bulletin of the Botanical Survey of India, Vol 20, No 1-4 (1978), Pagination: 80-90Abstract
This paper describes with illustrations a new species Anoectochilus nicobaricus Balakr. & Chakrab. and records with descriptions and a few illustrations, of 9 species, which are additions to Flora of India, namely Cymbidium pubescens Lindl., Dendrobium plicatue Lindl., Hetaeria oblongifolia (Bl.) Bl., Nervilia punctata (Bl.) Makino, Plocoglottis javanica Bl., Podochilus mkrophyltm Lindl., Pteroceras alatum (Holtt.) Holtt., Spathogloltis plicata Bl. and Vrydagzynea albidia (Bl.) Bl. One species Polystachya flavescens (Bl.) J. J. Smith is the first record from Andaman ana Nicobar Islands and its identity with reference to its distribution is discussed.Full Text
- Miliusa Mukerjeeana D. Mitra & P. Chakrab (Annonaceae)-A New Species from Andaman & Nicobar Islands
Abstract Views :190 |
PDF Views:107
Authors
Affiliations
1 Botanical Survey of India, Howrah, IN
2 Botanical Survey of India, Shillong, IN
1 Botanical Survey of India, Howrah, IN
2 Botanical Survey of India, Shillong, IN
Source
Nelumbo - The Bulletin of the Botanical Survey of India, Vol 33, No 1-4 (1991), Pagination: 326-328Abstract
No Abstract.Full Text
- Lyman Alpha Photometer: a far-ultraviolet sensor for the study of hydrogen isotope ratio in the Martian exosphere
Abstract Views :283 |
PDF Views:94
Authors
Raja V. L. N. Sridhar
1,
M. V. H. Rao
1,
K. Kalyani
1,
Anand Chandran
1,
Monika Mahajan
1,
J. D. P. V. Tayaramma
1,
K. V. S. Bhaskar
1,
K. B. Pramod
1,
L. V. Prasad
1,
A. S. Laxmiprasad
1,
P. Chakraborty
1,
J. A. Kamalakar
1,
G. Nagendra Rao
1,
M. Viswanathan
1
Affiliations
1 Laboratory for Electro-Optics Systems, Indian Space Research Organisation, Bengaluru 560 058, IN
1 Laboratory for Electro-Optics Systems, Indian Space Research Organisation, Bengaluru 560 058, IN
Source
Current Science, Vol 109, No 6 (2015), Pagination: 1114-1120Abstract
The Lyman Alpha Photometer (LAP), developed for flight on the Mars Orbiter Mission (MOM) spacecraft in 2013, is primarily designed to measure deuterium to hydrogen abundance ratio of the Martian exosphere over a 6-month period from a 263 km × 71,358 km elliptical orbit around Mars. A set of ultrapure (99.999%) hydrogen and deuterium gas-filled cells comprising tungsten filaments, a 25 mm diameter collection lens and a solar-blind photomultiplier tube together with an 8 nm bandpass Lyman alpha filter are the principal electro-optical assemblies of the instrument. This article presents scientific objectives of LAP and its performance specifications along with details of instrument design. The ground characterization techniques to assess LAP operational performance are also presented. End-to-end test results and evaluation matrix of LAP were satisfactory, well within the desired specifications. The first LAP onboard operation was carried out during the cruise phase of MOM spacecraft journey to verify its functionality and all recorded on-board health parameters were satisfactory.Keywords
Absorption gas cell, hydrogen isotope ratio, Martian exosphere, photometerFull Text
References
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- Arvidson, R. E. et al., Spirit Mars Rover Mission: overview and selectedresults from the northern Home Plate Winter Haven to the sideof Scamander crater. J. Geophys. Res. – Planets, 2010, 115, ArticleNumber: E00F03.
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- Ball, A. J., Price, M. E., Walker, R. J., Dando, G. C., Wells, N. S. andZarnecki, J. C., Mars Phobos and Deimos Survey (M-PADS) – AMartian Moons orbiter and Phobos lander. Adv. Space Res.,2009, 43, 120–127.
- Goerke, D., Mission to Mars: 2025: What We Can Do, iUniverse, Inc. 2007, vol. I; ISBN:9780595415878.
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- Gillmann, C., Lognonne, P., Chassefiere, E. and Moreira, M., The present-day atmosphere of Mars: where does it come from? Earth Planet. Sci. Lett., 2009, 277, 384–393.
- Machacek, J. R. et al., Production of excited atomic hydrogen and deuteriumfrom H2, HD and D2 photodissociation. J. Phys. B, At Mol. Opt. Phys., 2011, 44, 045201 (7 pp).
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- Owen, T., Maillard, J. P., Debergh, C. and Lutz, B., Deuterium on Mars: the abundance of HDO and the value of D/H. Science, 1988, 240, 1767–1770.
- Bjoraker, G. L., Mumma, M. J. and Larson, H. P., Isotopic abundance ratiosfor hydrogen and oxygen in the Martian atmosphere. Bull. Am. Astron. Soc., 1989, 21, 991.
- Korablev, O. I., Ackerman, M., Krasnopolsky, V. A., Moroz, V. I., Muller, C., Rodin, A. V. and Atreya, S. K., Tentative identification offormaldehyde in the Martian atmosphere. Planet. Space Sci., 1993, 41, 441–451.
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- Esposito, L. W., Colwell, J. E. and McClintock, W. E., Cassini UVISobservations of Saturn’s rings. Planet. Space Sci., 1998, 46,1221–1235.
- Formisano, V., Grassi, D., Ignatiev, N., Zasova, L. and Maturilli, A., PFS for Mars Express: a new approach to study Martian atmosphere. Adv. Space Res., 2002, 29, 131–142.
- Ito, Yuichi and Fukunish, Hiroshi, A deuterium/hydrogen Lyman alphaabsorption cell photometer developed for the Nozomi spacecraft. TohokuGeophys. J., 2006, 37, 2, 109–123.
- Maki, J., Lawrence, G., Esposito, L., Lauche, H. and Ludwig, M., TheCassini hydrogen deuterium absorption cell: a remote sensing instrumentfor atomic D/H measurements at Titan. Bull. Am.Astron. Soc., 1996, 28, 1132.
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- Sridhar Raja, V. L. N. et al., Design and engineering aspects of a compactLyman alpha photometer (LAP) for in situ measurements ofD/H ratio in Martian atmosphere. In 39th COSPAR ScientificAssembly, Mysore, India, C1.1-56-12, 2012, p. 1558.
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- Kawahara, T. D., Okano, S., Abe, T., Fukunishi, H. and Ito, K., Glass-type hydrogen and deuterium absorption cells developed for DyHratio measurements in the Martian atmosphere. Appl. Opt.,1997, 36, 2229–2237.
- Kawahara, T. D. et al., Development of hydrogen and deuterium absorptioncells for D/H ratio measurements of planetary atmospheres. TohokuGeophys. J., 1993, 34, 35–54.
- SCATSAT-1 Scatterometer:An Improved Successor of OSCAT
Abstract Views :258 |
PDF Views:97
Authors
T. Misra
1,
P. Chakraborty
1,
C. Lad
1,
P. Gupta
1,
J. Rao
1,
G. Upadhyay
1,
S. Vinay Kumar
1,
B. Saravana Kumar
1,
S. Gangele
1,
S. Sinha
1,
H. Tolani
1,
V. K. Vithani
1,
B. S. Raman
1,
C. V. N. Rao
1,
D. B. Dave
1,
R. Jyoti
1,
N. M. Desai
1
Affiliations
1 Space Applications Centre, ISRO, Ahmedabad 380 015, IN
1 Space Applications Centre, ISRO, Ahmedabad 380 015, IN
Source
Current Science, Vol 117, No 6 (2019), Pagination: 941-949Abstract
SCATSAT-1 is the Indian Space Research Organisation’s (ISRO’s) newest Ku-band scatterometer which was launched on 26 September 2016 from ISRO’s space-port Sriharikota on-board the PSLV C35 mission. It is an advanced follow-on of OSCAT, ISRO’s first Scatterometer in space on-board the Oceansat-2 satellite, which ceased to operate in April 2014. OSCAT had been a globally acclaimed sensor during its lifetime. The data from SCATSAT-1 exhibit superior quality, and will not only serve the operational wind and weather prediction community in the years to come, but also hold the promise of securing a place in the long-term climate data records. SCATSAT-1 is a standalone scatterometer mission atop the Indian Mini Satellite (IMS-2) bus. The scatterometer payload is a two-beam, dual-polarized, conically scanning, pencil beam, real-aperture radar which measures near-surface wind vectors over ocean exploiting Bragg scattering resonance at Ku-band. It has been developed in ISRO’s Space Applications Centre, Ahmedabad in less than two and half years to replace OSCAT. Although it inherits the instrument specifications from OSCAT, several enhancements have been made in its hardware as well as in the payload characterization from the purview of miniaturization and performance improvement over OSCAT. This article highlights the hardware improvements, the payload characterization methods devised, and the performance enhancements of SCATSAT-1 over OSCAT. The in-orbit performance of SCATSAT-1 is also discussed.Keywords
OSCAT, SCATSAT-1, Scatterometer, Sigma-0.Full Text
References
- Misra, T. et al., Oceansat-II scatterometer: sensor performance evaluation, σ 0 analyses and estimation of biases. IEEE Trans. Geosci. Remote Sensing, 2014, 52(6), 3310–3315.
- Biodiversity and Climate Change: Sustainable Development Perspective
Abstract Views :46 |
PDF Views:35
Authors
Affiliations
1 Centre for Ocean, River, Atmosphere and Land Sciences, Indian Institute of Technology, Kharagpur 721 302, IN
1 Centre for Ocean, River, Atmosphere and Land Sciences, Indian Institute of Technology, Kharagpur 721 302, IN
Source
Current Science, Vol 125, No 5 (2023), Pagination: 473-474Abstract
No Abstract.Keywords
No Keywords.Full Text